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I didn't program Java for very long, so I really never quite understood the best way to handle exceptions. (The one thing that I miss in Perl is compile-time checking of whether or not the exceptions are caught, but that's a side issue). Recently, I was struggling to get an API just write (sic) and the simplest way to do it seemed to be the following:

my $data = $self->__validate_added_data; if ( UNIVERSAL::isa( $data, 'Foo::Form' ) ) { # add the data } else { # process the error }

In other words, if I get back a valid Form object, I can add the data to the database. Otherwise, I have a hashref that contains the form error information. This error information is user error -- not program error. As a result, I don't want to die or warn, yet variants of those are typical Perl error handling mechanisms. Further, I have a method that returns two fundamentally different types of data: and object or a hashref. I finally started using the Error module and now use try/catch blocks to handle the types of errors that I need.

try { my $data = $self->__validate_added_data; # add the data } catch FormValidationError with { # process the error };

Combining this with Test::Exception has made my tests simpler and my code more self-documenting. However, I'm not entirely sure what are "best practices" for exception handling in this manner. Can anyone offer their wisdom?

Cheers,
Ovid

New address of my CGI Course.
Silence is Evil (feel free to copy and distribute widely - note copyright text)


In reply to Best Practices for Exception Handling by Ovid

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